Formed in 1969, the group was quickly signed by legendary promoter Bill Graham to his fledgling San Francisco Records label -- their self-titled debut LP appeared in 1970, supported by a series of high-profile opening dates at Graham's Fillmore venues. Despite strong critical notices, Hammer failed to earn much commercial attention, and although a second album was recorded, it was never released and the band dissolved. While Landsberg later collaborated with the Pointer Sisters, Guerin went on to co-found the pioneering fusion unit L.A. Express -- a prolific session drummer, he also played on Joni Mitchell's seminal Court and Spark and The Hissing of Summer Lawns sessions. ~ Jason Ankeny, Rovi